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ffmpeg and ffprobe subprocess call in python; extract specific frame at some timepoint, extract duration of a video
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import subprocess | |
import datetime | |
import numpy as np | |
THREAD_NUM=4 | |
def get_video_info(fileloc) : | |
command = ['ffprobe', | |
'-v', 'fatal', | |
'-show_entries', 'stream=width,height,r_frame_rate,duration', | |
'-of', 'default=noprint_wrappers=1:nokey=1', | |
fileloc, '-sexagesimal'] | |
ffmpeg = subprocess.Popen(command, stderr=subprocess.PIPE ,stdout = subprocess.PIPE ) | |
out, err = ffmpeg.communicate() | |
if(err) : print(err) | |
out = out.split('\n') | |
return {'file' : fileloc, | |
'width': int(out[0]), | |
'height' : int(out[1]), | |
'fps': float(out[2].split('/')[0])/float(out[2].split('/')[1]), | |
'duration' : out[3] } | |
def get_video_frame_count(fileloc) : # This function is spearated since it is slow. | |
command = ['ffprobe', | |
'-v', 'fatal', | |
'-count_frames', | |
'-show_entries', 'stream=nb_read_frames', | |
'-of', 'default=noprint_wrappers=1:nokey=1', | |
fileloc, '-sexagesimal'] | |
ffmpeg = subprocess.Popen(command, stderr=subprocess.PIPE ,stdout = subprocess.PIPE ) | |
out, err = ffmpeg.communicate() | |
if(err) : print(err) | |
out = out.split('\n') | |
return {'file' : fileloc, | |
'frames' : out[0]} | |
def read_frame(fileloc,frame,fps,num_frame,t_w,t_h) : | |
command = ['ffmpeg', | |
'-loglevel', 'fatal', | |
'-ss', str(datetime.timedelta(seconds=frame/fps)), | |
'-i', fileloc, | |
#'-vf', '"select=gte(n,%d)"'%(frame), | |
'-threads', str(THREAD_NUM), | |
'-vf', 'scale=%d:%d'%(t_w,t_h), | |
'-vframes', str(num_frame), | |
'-f', 'image2pipe', | |
'-pix_fmt', 'rgb24', | |
'-vcodec', 'rawvideo', '-'] | |
#print(command) | |
ffmpeg = subprocess.Popen(command, stderr=subprocess.PIPE ,stdout = subprocess.PIPE ) | |
out, err = ffmpeg.communicate() | |
if(err) : print('error',err); return None; | |
video = np.fromstring(out, dtype='uint8').reshape((num_frame,t_h,t_w,3)) #NHWC | |
return video |
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